Hello there
@Funny204311. First of all, I don't believe that your warning is a "random" warning. Staff give warning to players that break one of these rules:
https://www.cubecraft.net/threads/official-rules.134453/, depending of the rule breaked the punishment is lower or higher.
You can't appeal for a warning because it's not really a punishment, it's only a warning as it's name says. You must go carefully if you receive a warning because usually the next punishment is a higher penalty.
I advise you to contact with a Staff Member if you need more information.